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arena allocator: smaller minimum allocation size

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This commit is contained in:
Andrew Kelley 2020-05-20 15:57:02 -04:00
parent 8c10178a1e
commit b1bcdc96ca
1 changed files with 2 additions and 6 deletions
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8
lib/std/heap/arena_allocator.zig
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@ -47,12 +47,8 @@ pub const ArenaAllocator = struct {
fn createNode(self: *ArenaAllocator, prev_len: usize, minimum_size: usize) !*BufNode {
const actual_min_size = minimum_size + @sizeOf(BufNode);
var len = prev_len;
while (true) {
len += len / 2;
len += mem.page_size - @rem(len, mem.page_size);
if (len >= actual_min_size) break;
}
const big_enough_len = prev_len + actual_min_size;
const len = big_enough_len + big_enough_len / 2;
const buf = try self.child_allocator.alignedAlloc(u8, @alignOf(BufNode), len);
const buf_node_slice = mem.bytesAsSlice(BufNode, buf[0..@sizeOf(BufNode)]);
const buf_node = &buf_node_slice[0];